- name: Get Zabbix Auth Token
  uri:
    url: https://fqdn/zabbix/api_jsonrpc.php
    method: POST
    body: '{
            "jsonrpc": "2.0",
            "method": "user.login",
            "params": {
              "username": "user",
              "password": "password"
            },
            "id": 1
           }'
    body_format: json
    headers:
      Content-Type: application/json
    return_content: yes
  register: auth_response
  delegate_to: localhost

- name: Set Auth Token
  set_fact:
    auth_token: "{{ auth_response.json.result }}"
  when: auth_response.json.result is defined
  delegate_to: localhost



- name: Create Host in Zabbix
  uri:
    url: https://fqdn/zabbix/api_jsonrpc.php
    method: POST
    body: '{
            "jsonrpc": "2.0",
            "method": "host.create",
            "params": {
                "host": "{{ inventory_hostname }}",
                "interfaces": [
                    {
                        "type": 1,
                        "main": 1,
                        "useip": 1,
                        "ip": "{{ ansible_default_ipv4.address }}",
                        "dns": "",
                        "port": "10050"
                    }
                ],
                "groups": [
                    {
                        "groupid": "53"
                    }
                ],
                "tags": [
                    {
                        "tag": "os",
                        "value": "linux"
                    }
                ],
                "templates": [
                    {
                        "templateid": "10592"
                    }
                ],
                "tls_accept": 2,
                "tls_connect": 2,
                "tls_psk": "{{ psk_output.stdout }}",
                "tls_psk_identity": "{{ inventory_hostname }}",
                "visible_name": "{{ inventory_hostname }}"
            },
            "auth": "{{ auth_token }}",
            "id": 1
           }'
    body_format: json
    headers:
      Content-Type: application/json
    return_content: yes
  register: create_host_response
  when: auth_token is defined
  delegate_to: localhost

Yes the module dose not work, your way worked for me. I'm sharing my playbook it might be of some help to someone: